fix(agent): ensure token stream flushes

[gching]

Was noticing the last word for TTS was not being outputted (Websocket, ElevenLabs).
The input stream was not being flushed, and therefore, the remaining token was not being sent upstream.

Changes

• Ensure BufferedTokenStream ends the input and is flushed before closing
• Implement missing wrapping methods for BufferedWordStream so the underlying WordStream implementations isn't used

Reproduction

• Use voice agent pipeline with ElevenLabs
• Every spoken prompt would be missing the last word

Notes

• WordStream can probably be converted to an interface since the underlying implementation is technically not needed

[changeset-bot]

🦋 Changeset detected

Latest commit: f97f239

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@livekit/agents	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-silero	Patch

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[nbsp]

thanks a ton! caught this with SentenceStream, didn't think to add it here as well.

[nbsp]

ack re: WordStream as an interface, might address that in a future PR